My code looks like this:

Start-Transcript -Path "C:/test.txt"
Write-Host (Get-Date).ToString("yyyy-MM-dd_HH:mm:ss") "Starting"
$processes_using_oci_dll    =   Get-Process |  ? { (get-process -id $_.id -module | ? {$_.filename -like "*\oci.dll"})} 2> $null
Write-Host (Get-Date).ToString("yyyy-MM-dd_HH:mm:ss") "Ending"

When watching its output through a powershell cli, it looks nice, the Get-Process ... 2> $null avoids the permission issues from being displayed on screen.

Nevertheless, when I open the file C:/test.txt, I can see a huge amount of entries such as

  ... dll    =    Get-Process |  ? { (get-process -id $_.id -module | ? {$_ ...
                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      CategoryInfo          : PermissionDenied: (System.Diagnost... (aesm_service):Process) [Get-Process], 
ProcessCommandException
      FullyQualifiedErrorId : CouldnotEnumerateModules,Microsoft.PowerShell.Commands.GetProcessCommand
get-process : No se pueden enumerar los módulos del proceso "REDACTED".

My question is: How can I effectively keep these warnings from being Transcripted to the file C:/test.txt?

Thanks in advance!

CodePudding user response：

Apart from redirecting the error stream (#2) to $null, you can also use the -ErrorAction (alias -EA) common parameter, which is more readable and more efficient, as the error is suppressed at the source. It also gives you additional options, as follows:

• -ErrorAction SilentlyContinue suppresses the error message and continues executing the command.
• -ErrorAction Ignore suppresses the error message and continues executing the command. Unlike SilentlyContinue, Ignore doesn't add the error message to the $Error automatic variable.

$processes_using_oci_dll = Get-Process -EA Ignore | ? { (get-process -id $_.id -module -EA Ignore | ? {$_.filename -like "*\oci.dll"})}